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Entropy Example: If AS', = -198.3 J/K, is the reaction spontaneous at 25°C sys N₂ + 3H2 → 2NH3 • AS univ = AS sys + AS surr > ? • AS surr =-(AH sys)/T Determine the AHrxn • AH° N2(g) = 0 kJ/mol • AH°, H2(g) = 0 kJ/mol • AH˚ NH3(g) = -46.19 kJ/mol

Entropy Example: If AS', = -198.3 J/K, is the reaction spontaneous at 25°C sys N₂ + 3H2 → 2NH3 • AS univ = AS sys + AS surr > ? • AS surr =-(AH sys)/T Determine the AHrxn • AH° N2(g) = 0 kJ/mol • AH°, H2(g) = 0 kJ/mol • AH˚ NH3(g) = -46.19 kJ/mol

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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If ΔS ̊sys = -198.3 J/K, is the reaction spontaneous at 25 ̊C.

-ΔSuniv = ΔSsys + ΔSsurr > ?

- ΔSsurr =-(ΔHsys)/T

Determine the ΔHrxn

- ΔH ̊f N2(g) = 0 kJ/mol

- ΔH ̊f H2(g) = 0 kJ/mol

- ΔH ̊f NH3(g) = -46.19 kJ/mol

 

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Entropy Example: If AS', = -198.3 J/K, is the reaction spontaneous at 25°C sys N₂ + 3H2 → 2NH3 • AS univ = AS sys + AS surr > ? • AS surr =-(AH sys)/T Determine the AHrxn • AH° N2(g) = 0 kJ/mol • AH°, H2(g) = 0 kJ/mol • AH˚ NH3(g) = -46.19 kJ/mol
Transcribed Image Text:Entropy Example: If AS', = -198.3 J/K, is the reaction spontaneous at 25°C sys N₂ + 3H2 → 2NH3 • AS univ = AS sys + AS surr > ? • AS surr =-(AH sys)/T Determine the AHrxn • AH° N2(g) = 0 kJ/mol • AH°, H2(g) = 0 kJ/mol • AH˚ NH3(g) = -46.19 kJ/mol
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